Had the exact same result as Skip on a Nova. Same 3" full system exits behind the tire, Flowmaster Super 40's. System is built with flanges, took out the sections ahead of the mufflers 11.86/111.68 full exhaust, 11.63/114.88 open. I was stunned, I made my 1st pass down a dragstrip in 1960, and seeing a 3+ mph increase on a system that I felt was very efficient was jaw dropping.
Have a couple 9" bullet mufflers I'm going to put on the Catalina in the spring, that and an aluminum flywheel might be just enough to get by an old friend who has a max wedge 63 Plymouth that outruns me by about 3 tenths.
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68 Cat 2 dr sedan 461ci 670 heads XE284H 850 Holley
493/525 wide ratio 4sp 3:42 posi 13.07@105 full exhaust
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